[Elecraft] Charge build-up on antennas

[Bob - AG5Q]

During a rainstorm, how fast does charge build up on an antenna?
 I suppose the area of the wires and tubing would affect this, as
well as the amount of rain and wind. I'm wondering if a large resistor across the antenna connector (say, 10K to 100K) would be able
to discharge an antenna that is not connected to a rig or is a much smaller resistance required (like a short circuit) to limit the
voltage to no more than a few volts.

I'm assuming just an ordinary rain storm and neglecting the effect of lightning in the area.
Several years ago I noticed enough charge building up on a 20 meter dipole to jump across a small air gap of a ground switch that
wasn't closed completely.  This occured during a light rain storm.  However, I didn't take any quantitative data at the time.

This is a potential hazard to a rig if you connected an antenna without shorting the connector terminals first, but would it  be
enough to just put a resistor across the connector?

73/ Bob - AG5Q